ChIN简介页:Elemental Data Index (元素的物理数据)
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Elemental Data Index (元素的物理数据)



     M. A. Zucker, A. R. Kishore, and R. A. Dragoset

Office of Electronic Commerce in Scientific and Engineering Data
Physics Laboratory, National Institute of Standards and Technology

     The Elemental Data Index provides access to the holdings of NIST Physics Laboratory online data organized by element.

Atomic Spectra Database
This database contains critically evaluated NIST data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 52 elements. ASD contains data on about 950 spectra from about 1 ? to 200 μm, with about 70,000 energy levels and 90,000 lines, 40,000 of which have transition probabilities. The most current NIST-evaluated data associated with each transition are integrated under a single listing.

Spectrum of Platinum

An atlas of the spectrum of a platinum/neon hollow-cathode reference lamp in the region 1130 ? to 4330 ? is given, with the spectral lines marked and their intensities, wavelengths, and classifications listed. Graphical figures of the spectrum are included.

Ionization Data

This is a database primarily of total ionization cross sections of molecules by electron impact. The database also includes cross sections for a small number of atoms and energy distributions of ejected electrons for H, He, and H2. The cross sections were calculated using the Binary-Encounter-Bethe (BEB) model, which combines the Mott cross section with the high-incident energy behavior of the Bethe cross section. Selected experimental data are included.

X-Ray and Gamma Ray Data

X-ray Attenuation and Absorption for Materials of Dosimetric Interest

Tables and graphs of computed photon mass attenuation coefficients and mass energy-absorption coefficients from 1 keV to 20 MeV are presented for all of the elements (Z = 1 to 92) and for 48 compounds and mixtures of radiological interest. These coefficients are basic quantities used in calculations of the penetration and the energy deposition by photons (x-ray, gamma-ray, bremsstrahlung) in biological, shielding, and other materials.

XCOM: Photon Cross Sections Database

This database can be used to calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, in any element, compound or mixture, at energies from 1 keV to 100 GeV.

Form Factor, Attenuation, and Scattering Tabulation

The primary interactions of x-rays with isolated atoms from Z = 1 (hydrogen) to Z = 92 (uranium) are described and computed within a self-consistent Dirac-Hartree-Fock framework. The results are provided over the energy range from either 1 eV or 10 eV to 433 keV, depending on the atom. Self-consistent values of the f1 and f2 components of the atomic scattering factors are tabulated, together with the photoelectric attenuation coefficient for the atom, μ, and the value for the K-shell, μK, as functions of energy and wavelength.

Radiation Dosimetry Data

The databases ESTAR, PSTAR, and ASTAR calculate stopping-power and range tables for electrons, protons, or helium ions, according to methods described in ICRU Reports 37 and 49. Stopping-power and range tables can be calculated for electrons in any user-specified material and for protons and helium ions in 74 materials.

Nuclear Physics Data

Radionuclide Half-Life Measurements
This database is a table of the half lives of 61 important radionuclides measured primarily with ionization chambers by the Radioactivity Group of NIST. The included half lives range from 10 minutes to 60.7 years.

Isotopic Compositions
This database contains the isotopic compositions or abundances of those elements which have characteristic terrestrial compositions. Atomic weights are also available for elements 1 through 111.

Condensed Matter Physics Data

Atomic Reference Data for Electronic Structure Calculations
This database consists of evaluated data for use in total-energy calculations of electronic structure by density-functional theory. It contains total energies and orbital eigenvalues for the atoms hydrogen through uranium, as computed in several standard variants of density-functional theory.

Information about the Ground-State, Ionization Energy, & Atomic Weight Data

Atomic Weights are based upon 12C. Brackets [ ] indicate the mass number of the most stable isotope. Uncertainties are indicated in parentheses following the last significant figure to which they are attributed.

The ground-state and ionization data come from Ground Levels and Ionization Energies for the Neutral Atoms. Bibliographic references for the data can be found within the database.

  Thermochemical Data of Elements and Compounds (元素和化合物热化学数据,主要为无机物)
  WebElements (网上元素周期表 - 元素知识库)
  The Visual Elements Periodic Table (可视化元素周期表)

Summary by 李晓霞 on 2002-11-27

Last updated by 李晓霞 on 2002-11-27

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